cleanup_classid_environment(9)

💅 cleanup_classid_environment(9) 💅

okay so bestie, welcome to the Kernel API Manual — this is the cleanup_classid_environment(9) page and honestly it's a whole vibe of its own. it's short, it's sweet, and it does exactly one thing. let's get into it ✨

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🌸 NAME 🌸

cleanup_classid_environment — cleans up the cgroupv1 net_cls environment. that's it. that's the gig. she's a one-job queen 👑

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🎀 SYNOPSIS 🎀

void cleanup_classid_environment (void );

literally no arguments, no return value, no drama. immaculate energy honestly 🫶

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🦋 ARGUMENTS 🦋

• void — no arguments whatsoever. none. zero. the void of it all ✨

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💖 DESCRIPTION 💖

so at call time — like, the moment you invoke her — she moves the calling process to the root cgroup, and then runs the deletion process. order matters, bestie, she does not skip steps 💅

and if it fails? 😭 she'll print an error to stderr and then try to continue. not me showing up to the function call with the "we ball" mindset — she's not gonna bail on you, she's gonna keep going. iconic resilience, no cap 🔥

heads up: on failure you will get that error message on stderr, but she still attempts to carry on rather than stopping dead. just so you know what you're getting into 🙈

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👑 SEE ALSO 👑

• Kernel file ./tools/testing/selftests/bpf/cgroup_helpers.c
• enable_controllers(9)
• write_cgroup_file(9)
• write_cgroup_file_parent(9)
• setup_cgroup_environment(9)
• join_cgroup(9)
• join_root_cgroup(9)
• join_parent_cgroup(9)
• set_cgroup_xattr(9)
• __cleanup_cgroup_environment(9)
• cleanup_cgroup_environment(9)
• get_root_cgroup(9)
• create_and_get_cgroup(9)
• get_cgroup_id_from_path(9)
• setup_classid_environment(9)
• set_classid(9)
• join_classid(9)
• get_classid_cgroup_id(9)
• get_cgroup1_hierarchy_id(9)
• open_classid(9)

like, the whole cgroup friend group showed up to the function reference party 🎉 go read all of them, iykyk 💜

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🌈 that's the whole page bestie — sourced from ./tools/testing/selftests/bpf, dated October 2026, and filed under cleanup_classid_environment(9). mwah, go clean up that environment 💋🎀